Fault diagnosis
A faint second image down the page.
Ghosting is the previous part of the image reappearing lower down. The distance it reappears at tells you which part is holding the charge.
Ghosting is a faint repeat of an image appearing further down the same page. On a laser printer it means a component is not fully clearing its previous charge or its residual toner between rotations — usually the drum, the charge roller, or a fuser that is not releasing cleanly. Old or damp paper and very high-contrast originals make it worse.
Measure the gap
The distance between the real image and its ghost is the circumference of whatever is causing it. Every rotating part is a different size, so that measurement points straight at the component — the same technique used for repeating marks.
Print a page that shows it clearly, measure from the original to the ghost in millimetres, and mention that number when you call. It usually takes the diagnosis straight to the part.
The usual causes
Drum not fully discharging
The drum has to be wiped clean electrically between images. As it ages it holds a faint residual charge, and the previous image reappears one rotation later. This is the most common cause and it means the drum is nearing the end.
Charge roller worn or dirty
The charge roller re-charges the drum uniformly before each image. If it is contaminated it charges unevenly, and the last image shows through.
Fuser not releasing cleanly
Toner sticking to the fuser roller and being deposited back onto the next revolution of the paper. This ghost is usually slightly glossy compared with the rest of the page.
Paper
Damp or very old paper takes the charge unevenly and can produce ghosting on a perfectly healthy machine. Given the humidity in Chennai this is worth eliminating before anything is replaced — try a fresh ream from a sealed pack.
The image itself
A large solid black area followed by white is the hardest thing you can ask a laser printer to do. Some ghosting on a big solid block, on an otherwise fine machine, is the design being pushed rather than a fault.
What to try
- Fresh paper from a sealed pack
- Print the same document on a different machine — rules out the file
- Let the printer warm up fully; ghosting is often worse on the first pages from cold
- If you have a spare cartridge, swap it — if the ghost goes, it is drum or charge roller
If it persists with fresh paper and a different cartridge, it is the fuser or the charge system, and that is bench work.
Common questions
What is ghosting on a laser printer?
A faint repeat of part of the image appearing further down the same page, caused by a component not fully clearing the previous image — usually the drum, charge roller or fuser.
Does ghosting mean I need a new cartridge?
Often, since the drum and charge roller are usually inside the cartridge. Swapping in a different cartridge is the quickest way to confirm it before buying anything.
Why is ghosting worse on the first few pages?
The fuser has not reached working temperature. Ghosting that clears once the machine warms up points at the fuser rather than the drum.
Can paper cause ghosting?
Yes. Damp or old paper takes charge unevenly. In Chennai humidity that is a genuine cause, so try a fresh sealed ream before replacing parts.
Tell us what it is doing.
Call and describe the make and the symptom — most jobs are done in a single visit, and we will tell you straight if it is not worth repairing.